Figures most commonly used to define norms for the length of the designated stages of labor are controversial yet widely quoted and are based on the work of ____.

Question

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The figures most commonly used to define norms for the length of the designated stages of labor are based on the work of Dr. Emanuel A. Freidman, a prominent obstetrician who developed a widely used curve of labor progress in the 1950s.

Figures Most Commonly Used to Define Norms for the Length